In the female rabbit, the common tube formed by the union of the urinary bladder and the vagina is called the:

1. In the female rabbit the two uteri join to form the vagina. 2. The urinary bladder and the vagina then unite into one common tube. 3. This common tube is the urinogenital canal or vestibule. 4. It opens to the exterior at the vulva, so option A is correct. 5. Option B fallopian tube is the anterior part of the oviduct, the trap. 6. Option C urethra carries only urine in some animals, so it is wrong here. 7. Option D ureter runs from the kidney to the bladder, not after the vagina. _Source: Samacheer Kalvi (TN SCERT) Class 10 Science, Unit 13 Structural Organisation of Animals "Female reproductive system", p.204_